The LCR route is controlled by the enabled Least Cost Routing Access Rights. These enabled LCR classes-of-service (LCR in LCOSV/LCOSD) are administered by the AMO COSSU. It is possible to modify these enabled LCR classmark subset as a function of source and destination node. Two LCR class-of-service powersets are used for this modification. One access right powerset is used for reducing access rights from LCR classmark subset and the other for adding specified rigths. Using the modified LCR access rights as usual enables choosing one route and prevent choosing another route depending on source/destination information. The modification is working for the current connection only, without permanent changes in LCOSV/LCOSD of the calling party.